Beer was thrown at Lewes goalkeeper Scott Ward as trouble broke out during Saturday's home match with Newport County.
This was the second outbreak of trouble at the Dripping Pan in two months.
Ten Newport fans were ejected from the ground during the match and three more were arrested for public order offences after the 2-2 draw.
Scott said: "It was atrocious. My hair was drenched in beer.
"It kicked off when they scored - eight Newport fans ran onto the pitch. I thought 'this can't be happening'.
"They were abusing me from behind the goal, then, all of a sudden, beer was thrown.
"I went to the referee and, fortunately, he'd spotted it."
The referee spoke with police and Newport's captain pleaded with the 30 visiting supporters.
Scott said the incident was worrying: "It can distract you because you don't know what may be thrown at you next."
Newport fans have an affiliation with West Ham, who were playing Brighton and Hove Albion at Withdean the same afternoon.
That ended in a 2-2 draw and the arrest of three West Ham fans.
Sergeant Mark Cranley, of Lewes police, said: "We were aware of the potential for trouble and made sure we had enough resources."
More than 300 police attended the West Ham game.
In March, two Lewes football players were racially abused at the Dripping Pan during the tie with Bognor.
Lewes were celebrating their 2-1 win when the club's two black players, Barrington Belgrave and Francis Duku, allegedly had racist insults hurled at them.
Two Bognor fans were arrested.
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